rm obsolete merge testnet documentation (#4747)

docs/kiln_geth_local_testnet.md

@@ -1,31 +0,0 @@
-# How to run Geth
-
-- Clone Geth: `git clone https://github.com/ethereum/go-ethereum.git ~/go-ethereum`
-- Build Geth with `make geth`
-- Run `scripts/run-catalyst.sh` to run Geth. It listens on port 8551.
-
-# Verify Geth and Nimbus interoperate
-
-- Clone Nimbus
-- Run `scripts/run-catalyst.sh`. This depends on the paths set up in the first section. If those are changed, adjust accordingly.
-- Run `./env.sh nim c -r scripts/test_merge_vectors.nim`. It should show output akin to:
-
-```
-[Suite] Merge test vectors
-  [OK] getPayload, newPayload, and forkchoiceUpdated
-```
-
-# How to run Nimbus local testnet with Geth
-
-- Check out branch `kiln`
-- Run (and keep running) `./scripts/run-catalyst.sh`.
-- Run `./scripts/launch_local_testnet.sh --preset minimal --nodes 4 --disable-htop --stop-at-epoch 7 -- --verify-finalization --discv5:no`
-
-This creates a 4-node local testnet with 128 validators.
-
-The Nimbus console output will be similar to
-![./nimbus_localhost_run.png](./nimbus_localhost_run.png)
-The broken pipe on `tail` is normal, and unrelated to merge aspects of Nimbus.
-
-Meanwhile, Nimbus is interacting with Geth in preparing, getting, and executing payloads:
-![./kiln_geth_logs.png](./kiln_geth_logs.png)